Current-to-voltage converter with low noise, wide bandwidth and

Details Current-to-voltage converter with low noise, wide bandwidth and Current-to-voltage converter with low noise, wide bandwidth and

1991-10-08

1993-08-17

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

Constant current to constant voltage or vice versa

324120, 330260, 330288, 330297, H02M 700

Patent

active

052374939

ABSTRACT:
The design of a current-to-voltage converter with a uniform transfer function in its feedback loop (12) is proposed. It employs a very large, double-shielded measuring resistance (13) and a two-stage setup to perform a fully linear I/V conversion with a conversion factor of 10.sup.10 V/A and a bandwidth of 1 MHz. With the low noise level attained, and with the bandwidth and conversion factor mentioned, it will be possible to monitor events involving as few as 300 electrons. The current-to-voltage converter comprises a differential input amplifier (8), a current source (11) for supplying said differential amplifier (8), at least one operational amplifier (10, 14), and a high-valued measuring resistance (13) the voltage drop across which is being taken as a measure of the current to be detected. The measuring resistance (13) is arranged in a feedback loop (12) associated with said differential amplifier (8). The measuring resistance (13) is double-shielded from the remainder of the current/voltage converter circuitry through its arrangement inside a cylindrical capacitor C which acts as a first shield, and which is in turn connected to a casing (15, 25) surrounding the differential amplifier (8) and the feedback loop (12) and which constitutes a second shield.

REFERENCES:
Electric Design news, vol. 31, No. 4, Feb. 1986, pp. 225-228, "Use a G Decade Box to Calibrate Picoammeters".
Nuclear Instruments and Method in Physics Research/Section A., vol. A253, No. 3, Jan. 15, 1987, pp. 427-433, "Integrated Low Noise Amplifies in CMOS Technology".
Nuclear Instruments & Methods, Vol. 25, No. 2, Jan. 1964, pp. 317-327, "Electrometer Circuit Design for Extended Band Widths".
F. J. Sigworth, "Single Channel Recording" 1983, pp. 3-35, Sakman & Neher Ed.

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